echo 74 > /sys/class/gpio/export
echo 75 > /sys/class/gpio/export
echo out > /sys/class/gpio/gpio74/direction
echo out > /sys/class/gpio/gpio75/direction
echo 0 > /sys/class/gpio/gpio74/value
echo 0 > /sys/class/gpio/gpio75/value

#turnOFF left channel
#echo 1 > /sys/class/gpio/gpio74/value

#turn OFF right channel
#echo 1 > /sys/class/gpio/gpio75/value
